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-Copyright (c) 2009-2012 Bitcoin Developers
-Distributed under the MIT/X11 software license, see the accompanying
-file COPYING or http://www.opensource.org/licenses/mit-license.php.
-This product includes software developed by the OpenSSL Project for use in
-the OpenSSL Toolkit (http://www.openssl.org/).  This product includes
-cryptographic software written by Eric Young (eay@cryptsoft.com) and UPnP
-software written by Thomas Bernard.
-
-
-UNIX BUILD NOTES
-================
-
-To Build
---------
-
-cd src/
-make -f makefile.unix            # Headless bitcoin
-
-See readme-qt.rst for instructions on building Bitcoin-Qt,
-the graphical user interface.
-
-Dependencies
-------------
-
- Library     Purpose           Description
- -------     -------           -----------
- libssl      SSL Support       Secure communications
- libdb4.8    Berkeley DB       Blockchain & wallet storage
- libboost    Boost             C++ Library
- miniupnpc   UPnP Support      Optional firewall-jumping support
-
-miniupnpc may be used for UPnP port mapping.  It can be downloaded from
-http://miniupnp.tuxfamily.org/files/.  UPnP support is compiled in and
-turned off by default.  Set USE_UPNP to a different value to control this:
- USE_UPNP=-    No UPnP support - miniupnp not required
- USE_UPNP=0    (the default) UPnP support turned off by default at runtime
- USE_UPNP=1    UPnP support turned on by default at runtime
-
-IPv6 support may be disabled by setting:
- USE_IPV6=0    Disable IPv6 support
-
-Licenses of statically linked libraries:
- Berkeley DB   New BSD license with additional requirement that linked
-               software must be free open source
- Boost         MIT-like license
- miniupnpc     New (3-clause) BSD license
-
-Versions used in this release:
- GCC           4.3.3
- OpenSSL       1.0.1c
- Berkeley DB   4.8.30.NC
- Boost         1.37
- miniupnpc     1.6
-
-Dependency Build Instructions: Ubuntu & Debian
-----------------------------------------------
-Build requirements:
- sudo apt-get install build-essential
- sudo apt-get install libssl-dev
-
-for Ubuntu 12.04:
- sudo apt-get install libboost-all-dev
-
- db4.8 packages are available at:
- https://launchpad.net/~bitcoin/+archive/bitcoin
-
- Ubuntu precise has packages for libdb5.1-dev and libdb5.1++-dev,
- but using these will break binary wallet compatibility, and is not recommended.
-
-for other Ubuntu & Debian:
- sudo apt-get install libdb4.8-dev
- sudo apt-get install libdb4.8++-dev
- sudo apt-get install libboost1.37-dev
- (If using Boost 1.37, append -mt to the boost libraries in the makefile)
-
-Optional:
- sudo apt-get install libminiupnpc-dev (see USE_UPNP compile flag)
-
-
-Dependency Build Instructions: Gentoo
--------------------------------------
-
-Note: If you just want to install bitcoind on Gentoo, you can add the Bitcoin
-      overlay and use your package manager:
-          layman -a bitcoin && emerge bitcoind
-
-emerge -av1 --noreplace boost glib openssl sys-libs/db:4.8
-
-Take the following steps to build (no UPnP support):
- cd ${BITCOIN_DIR}/src
- make -f makefile.unix USE_UPNP= USE_IPV6=1 BDB_INCLUDE_PATH='/usr/include/db4.8'
- strip bitcoind
-
-
-Notes
------
-The release is built with GCC and then "strip bitcoind" to strip the debug
-symbols, which reduces the executable size by about 90%.
-
-
-miniupnpc
----------
-tar -xzvf miniupnpc-1.6.tar.gz
-cd miniupnpc-1.6
-make
-sudo su
-make install
-
-
-Berkeley DB
------------
-You need Berkeley DB 4.8.  If you have to build Berkeley DB yourself:
-../dist/configure --enable-cxx
-make
-
-
-Boost
------
-If you need to build Boost yourself:
-sudo su
-./bootstrap.sh
-./bjam install
-
-
-Security
---------
-To help make your bitcoin installation more secure by making certain attacks impossible to
-exploit even if a vulnerability is found, you can take the following measures:
-
-* Position Independent Executable
-    Build position independent code to take advantage of Address Space Layout Randomization
-    offered by some kernels. An attacker who is able to cause execution of code at an arbitrary
-    memory location is thwarted if he doesn't know where anything useful is located.
-    The stack and heap are randomly located by default but this allows the code section to be
-    randomly located as well.
-
-    On an Amd64 processor where a library was not compiled with -fPIC, this will cause an error
-    such as: "relocation R_X86_64_32 against `......' can not be used when making a shared object;"
-
-    To build with PIE, use:
-    make -f makefile.unix ... -e PIE=1
-
-    To test that you have built PIE executable, install scanelf, part of paxutils, and use:
-    scanelf -e ./bitcoin
-
-    The output should contain:
-     TYPE
-    ET_DYN
-
-* Non-executable Stack
-    If the stack is executable then trivial stack based buffer overflow exploits are possible if
-    vulnerable buffers are found. By default, bitcoin should be built with a non-executable stack
-    but if one of the libraries it uses asks for an executable stack or someone makes a mistake
-    and uses a compiler extension which requires an executable stack, it will silently build an
-    executable without the non-executable stack protection.
-
-    To verify that the stack is non-executable after compiling use:
-    scanelf -e ./bitcoin
-
-    the output should contain:
-    STK/REL/PTL
-    RW- R-- RW-
-
-    The STK RW- means that the stack is readable and writeable but not executable.